diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -306,7 +306,10 @@
             except IOError as inst:
                 if inst.errno != errno.EPIPE:
                     raise
-            ret = -1
+            if req.ui.configbool(b'ui', b'detailed-exit-code'):
+                ret = 250
+            else:
+                ret = -1
         finally:
             duration = util.timer() - starttime
             req.ui.flush()  # record blocked times
diff --git a/tests/test-commandserver.t b/tests/test-commandserver.t
--- a/tests/test-commandserver.t
+++ b/tests/test-commandserver.t
@@ -778,7 +778,7 @@
   *** runcommand debugsuicide
   interrupted!
   killed!
-   [255]
+   [250]
 
 #endif